Thanks for the support. In this instance it is my many more years (I started when I was 12) of being a motorcycle raodracing corner worker / safety crew (rather than as a racer myself), and watching lots of OTHER people crash that drives my observations.
In terms of airbags, one of the biggest things to reduce injuries in motorcycle roadracing is the use of Air Fence (basically a giant airbag) in front of anything you might run INTO at the track.
For instance see https://www.roadracingworld.com/news/video-airfence-saves-lives/. If you donāt want to listen to the whole backstory on the video, jump forward to about 3min 33 sec to see AirFence in action.
That is the kind of crash that, in the years before Airfence, killed racers. Corey missed one race.
I only know the rider in the video, Corey Alexander, a little - I met him this year at Daytona, where he finished well - but I used to race against his uncle, Richie Aleander Jr, and bought helmets, gloves, boots, etc. from his grandfather Richie Alexander Sr., so I know the family.